下图是人体血液循环和气体交换示意图请据图回答下列问题图中2代表 由2到3的循环途径为 循环其主要作用是为组织细胞提供 和 同时运走 Template




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tomski下图是人体血液循环和气体交换示意图请据图回答下列问题图中2代表 由2到3的循环途径为 循环其主要作用是为组织细胞提供 coloring